package com.sky.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceIpml implements UserService {
    //vx服务接口地址
    private static final String VX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    public UserMapper userMapper;

    @Autowired
    private WeChatProperties weChatProperties;

    @Override
    public User login(UserLoginDTO userLoginDTO) {
        String openid = getOpenid(userLoginDTO.getCode());
        //判断openid是否为空，
        if (openid == null) {
            //为空表示登录失败，抛出业务异常
            throw new LoginFailedException(MessageConstant.USER_NOT_LOGIN);
        }

        //登录成功 ，判断用户是否为新用户
        User user = userMapper.getUserByOpenId(openid);
        //如果是新用户，自动完成注册
        if (user == null) {
             user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();

            userMapper.insert(user);
        }
        //返回用户对象
        return user;
    }

    private String getOpenid(String code) {
        //调用vx接口服务，获取登录当前用户的openid
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");
        //返回一个json数据
        String json = HttpClientUtil.doGet(VX_LOGIN, map);
        //解析json
        JSONObject jsonObject = JSONObject.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
